|
ASTM A307
Bolts Specification-NINGBO BOLT |
ASTM A307
Specification for carbon steel bolts, studs, threaded rods & similar externally
fasteners with min 60 ksi tensile strength.
ASTM A307
specification covers the chemical and mechanical requirements for three grades
(Grades A, B, and C) of carbon steel bolts, studs, threaded rods with minimum
tensile requirement of 60 ksi. However Grade C has been replaced by ASTM F1554
Grade 36 Specification. A307 specification does not cover the requirements for
machine screws, thread cutting/forming screws, mechanical expansion anchors, or
other similar externally threaded fasteners. When tested, sampled specimens
shall adhere to specified values for chemical composition, hardness, tensile
strength, yield point, elongation, and dimensions.
Bolt Grades
|
Type |
Description |
|
Grade A |
Bolts with
a minimum tensile strength of 60 ksi, intended for general purpose
applications. |
|
Grade B |
Bolts with
a tensile strength between 60 to 100 ksi and intended for flanged joints
in piping systems. |
|
Grade C |
Replaced
with ASTM F1554 Grade 36 Specification |
Chemical Composition
|
Element |
Grade A |
Grade B |
|
Carbon |
0.29 |
0.29 |
|
Manganese,
max |
1.20 |
1.20 |
|
Phosphorus,
max |
0.04 |
0.04 |
|
Sulfur, max |
0.15 |
0.05 |
Mechanical Properties
|
Bolt Grade |
Diameter,
Inch |
Tensile
Strength, ksi |
Elongation, % |
Hardness, BHN |
|
A |
1/4 to 4,
Inclusive |
60 |
18 |
121 - 241 |
|
B |
1/4 to 4,
Inclusive |
60 - 100 |
18 |
121 - 212 |
Recommended Nuts &
Washers
|
Bolt
Specification |
Bolting
Diameter, Inch |
Nut
Specification |
Washer
Specification |
|
A307 Grade
A |
1/4 to 4,
Inclusive |
ASTM A563
Grade A |
SAE |
|
A307 Grade
B |
1/4 to 4,
Inclusive |
ASTM A563
Grade B |
F436 |
|
